Confidence isn't the same as correctness
It's tempting to think of medical consensus as a straight line: knowledge accumulates, and we simply know more each year than the year before. The real history is messier. Again and again, treatments that were mainstream, respected, and even prescribed by doctors have later turned out to be harmful — sometimes for years, sometimes for decades, before the evidence forced a change.
Here's the uncomfortable part we don't say often enough: a meaningful share of that delay wasn't innocent. Behind plenty of these stories sits a company, an industry, or an institution with a financial or political stake in the "consensus" staying exactly as it was — dressed up in the language of science, endorsed by respected experts, and defended long after the warning signs were impossible to miss. Commercial interest wearing the coat of science is not a conspiracy theory; it's a documented, repeating pattern in medical history.
Which is exactly why questioning it matters — not as a fringe habit, but as a basic skill. And it's a skill that much of society has quietly lost, or had taken from it.
A century of "settled science"
A few examples, spanning more than a hundred years:
- Heroin, sold as a children's cough remedy. From 1898, Bayer marketed heroin as a safe, non-addictive alternative to morphine — including in remedies aimed at children's coughs and colds. It stayed on the market for over a decade before the risks were fully reckoned with, and it wasn't banned in the US until 1924.
- Mercury-based teething powders. Calomel (mercurous chloride) powders were a routine remedy for teething discomfort in infants well into the twentieth century, before being linked to acrodynia — a form of mercury poisoning in children that came to be called "pink disease."
- Radioactive tonics. In the 1920s, products like Radithor — literally water laced with radium — were sold as vitality boosters. Industrialist Eben Byers reportedly drank over a thousand bottles before dying of radiation poisoning in 1932, a case that helped trigger public and regulatory alarm.
- "More doctors smoke Camels than any other cigarette." For decades, physicians appeared in cigarette advertising, lending medical credibility to smoking — years before the link to cancer became impossible to ignore.
- Thalidomide. Developed in the mid-1950s and prescribed through the late 1950s and early 1960s for morning sickness and insomnia, thalidomide was withdrawn after it became clear it was causing severe birth defects in thousands of children.
- Margarine over butter. From the 1960s, health bodies recommended margarine as the heart-healthy alternative to butter. Much of that era's margarine was high in artificial trans fats — later shown to raise cardiovascular risk more than the saturated fat it replaced.
- Low-fat, high-sugar diets. As dietary guidance from the late 1970s and 1980s pushed people to cut fat, manufacturers often replaced it with added sugar — a shift that lines up closely with the sharp rise in obesity from the 1980s onward.
- OxyContin. Launched in 1996 and marketed as carrying a low risk of addiction, it became a central driver of the opioid crisis that followed.
- Vioxx. Approved in 1999 for arthritis pain, it was voluntarily withdrawn by Merck in 2004 after trial data linked long-term use to a higher risk of heart attack and stroke.
Each of these was, at the time, considered reasonable — even progressive. That's the uncomfortable part.
It happened in rehab, too
This isn't just a pharmacy story. Musculoskeletal care has had its own reversals:
- RICE (Rest, Ice, Compression, Elevation) was the standard advice for soft-tissue injuries for decades. More recent evidence favours early, guided movement over prolonged rest and icing, which is why many clinicians now use frameworks like PEACE & LOVE instead.
- Bed rest for acute low back pain and sciatica was routinely advised for years. A Cochrane review of the evidence found that advising patients to stay active leads to outcomes that are as good as, or better than, bed rest — with none of the downsides of prolonged inactivity.
Neither of these was a fringe opinion at the time. They were the guidance in textbooks and clinics, until the outcome data said otherwise.
Why this keeps happening
A few forces show up again and again in these stories. Incomplete evidence at the time a treatment was adopted is one. But look closely at almost every example above and you'll also find a second, less comfortable force: money. Bayer kept selling heroin for over a decade after concerns were raised, because it sold well. The margarine and low-fat food industries funded decades of dietary advice that happened to favour their products. Purdue Pharma built a sales force around reassuring doctors that OxyContin was safe, because reassured doctors prescribed more of it. Merck kept Vioxx on the market while sitting on cardiovascular data. None of this required a grand cover-up — just an industry with a product to sell, and experts willing to lend it credibility.
That's the part worth saying plainly: not every "consensus" is purely a scientific conclusion. Some of it is science; some of it is marketing wearing a lab coat. Telling the difference is a skill, not an instinct, and it's one we think our education system has, whether by neglect or by design, mostly stopped teaching.
Why we're not taught to question
Most of us went through a school system built around a syllabus, a set curriculum delivered on a timetable, and a final exam that rewards recalling the "correct" answer, not interrogating where that answer came from or who benefits from it being accepted. You pass by reproducing what you were given. You are rarely, if ever, graded on asking "why should I believe this, and who decided it was true?"
That's not a neutral gap. A population that's fluent in memorising answers but out of practice questioning them is, by definition, an easier population to sell a "consensus" to — whether that consensus is a cough remedy, a diet, a painkiller, or a treatment protocol. Rebuilding the habit of asking "why" isn't optional intellectual flair. It's the one skill that, across every example above, would have shortened the years between "everyone agrees" and "we were wrong."
The lesson isn't "don't trust medicine" — it's "question everything, including us"
None of this means science doesn't work, or that every clinician or company is acting in bad faith. It means science works precisely because it's willing to overturn its own consensus when the data demands it — and that process only happens as fast as people are willing to keep asking uncomfortable questions of the people and institutions with something to gain from the answer staying the same.
So the right takeaway isn't blanket distrust. It's a habit, reclaimed: ask what the evidence actually shows for your specific situation, ask who benefits if you simply accept the standard answer, be wary of one-size-fits-all protocols that haven't been revisited in years, and expect anyone treating you — including us — to be able to explain the "why," not just the "what."
How this shapes the way we work at BPR
It's part of why we lean on objective diagnostics — infrared thermography, HRV monitoring, and a proper assessment of what's actually driving your pain — rather than defaulting to a generic protocol because "that's what's usually done" for your diagnosis. Treatment approaches that were standard ten years ago have, in some cases, already been revised by better evidence. We'd rather build your plan around what the evidence and your body are actually telling us, and keep updating it as the evidence does.
And we'd genuinely rather you ask us "why this, and not that?" than assume we're right because we're the clinic. If an answer we give you is just "that's the protocol," push back — that's not a good enough answer, from us or from anyone.
Frequently asked questions
Does this mean I shouldn't trust my doctor or physio? No — it means the good ones welcome the question "why this treatment, for me, specifically?" and can answer it with more than "it's standard practice."
How do I know if a treatment I've been given is outdated? You generally don't need to work this out alone. Ask your clinician what the current evidence says and whether your specific case might warrant a different approach — a good practitioner will be glad to walk you through it.
Isn't questioning consensus how misinformation spreads? It can be, when "questioning" means rejecting evidence in favour of a preferred belief. The distinction here is asking practitioners to justify current practice with current evidence — not rejecting evidence itself.